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How to Add, Change, and Reprogram a Mazda 3 Spare KeyIt’s a good idea to have an extra key on hand regardless of whether you lost the keyfob you were using or it stopped working. This article will explain everything you need to know about adding, changing, or changing the programming of your Mazda 3 key fobs.Warning: Some keys require programming by professional locksmiths, while others do not. Be sure to only use genuine Mazda replacements for your key fob.How to add a spare keyIf you’re not fortunate enough to receive a spare keys from the dealership when you buy your Mazda 3 or accidentally break your current one but don’t worry, there’s a way to add another key. You’ll need to use a flathead screwdriver, and the CR2025 replacement battery. Once you’ve got the tools then it’s time to access the key fob and replace the battery. Locate the key release auxiliary. The button is located on the underside the metal portion. It’s easy to locate. Once you hit the button, the back cover should be removed immediately. Next, insert the head of the screwdriver into the notch, or the spacing at the top of the metal piece and then pull it off.Insert your spare key or a new one into the slot following the removal of the auxiliary key. Turn the ignition on and wait for approximately five seconds before turning it to OFF. This will register the new information on the key to the system which will allow it to start your car in the future.It is only possible to program three keys in your Mazda 3. The most important thing is to have more than two working key fobs but not be able to get your car started. This is a security measure designed to prevent unauthorised users, such as valet drivers from activating your key and starting your car.How to reprogram a spare key?It’s smart to know how to reprogram a spare key in the event that your original key is lost or stolen. This will prevent unauthorised persons from stealing your car and starting it. This will work with any Mazda. You’ll require two keys that are working to start the reprogramming process. If you don’t own two working keys, it’s best to take your Mazda to a dealer to have this done.Start by stepping into the driver’s position, and close all the doors with the exception of the one that is open. Put the first working key into the slot, and then set the ignition to ON. Take five seconds before removing the key. Repeat with the second key.Once mazda rx8 key replacement cost ‘ve completed programming your new key, you should have 3 keys that will allow you to start your car in the future. Before placing each key in storage, make sure that it’s functioning properly.You should consider buying an extra Mazda 3 remote, especially if your car is prone to problems. You can buy one online or at a local automotive store, but make sure to read reviews before buying so you aren’t buying a key fob that’s not compatible with your car.How do I change the battery on a spare keyThere’s nothing worse than finding that your key fob battery has gone out and you’re not able to unlock your car. It’s easy to change the battery yourself and save money at the dealer.Press the auxiliary button on the back of the keyfob. This will remove the metal auxiliary key and expose slots on both sides of the case. Press the flathead into one of these slots and then gently pull the two halves apart. When the battery is completely exposed, remove it and put it away in a place where you will not forget it.Before you begin, be sure you have a new replacement battery. They can be bought at any retailer that sells batteries or from a Mazda dealer in Winter Garden. Using the correct type of battery will ensure that your key fob operates correctly.Replace the cap on the battery, and then insert the new battery. Be careful not damage the rubber ring that holds the battery. Then, press the two halves of the key fob together until you hear an audible click.How can I reset the Keyless Entry SystemThe key fob in your Mazda 3 is not only an added convenience, but it’s also an important security feature. The car will not start if the key is lost or stolen even if you have an extra fob. The key fob needs to be reprogrammed by a dealer to allow it to work again. This can be an expensive and stressful experience and it’s a good idea to know how to reset the system yourself.To reset the system, disconnect the battery for around 15 minutes. This will clear any residual electricity from the on-board computer. Next, disconnect both the LF-ECU connector and the demand switch connectors. After that, test for continuity between the following terminals:Put the key in the slot and turn the ignition ON. The key should remain in the ignition for about five seconds and then switch it off. The key’s details will be added to the vehicle’s computer and the new fob will be able start your car in the future. You can program as many fobs as you want however only one must be used at any specific time. This will stop unauthorized individuals from stealing your key and gaining access to your car. You can buy a new keyfob online, however it’ll still need to be cut and programmed by an authorized dealer.